Hydraulic-seal safety-valve.



No. 883,700. PATENTBD ABR. 7, 1908.

' A. B. DRAGrBR.A

HYDRAULIC SEAL SAFETY VALVE.

APPLICATION FILED AUG. '1, 1907.

5' Q Witnesses. g 6 Inventor.

. for Welding ironf or steellate s.

-' UNITED STAIENT OFFICE. i

ALEXNDER BEENHAED ERGEE, or LBECK, GERMANY, AssrGNon oF ONE-HALF To THEk EIEM oF DEAGEEWEEK, HEINR. a BERNE. DEGEE, oF LBECK, GERMANY, `AND oNE- l lHALF TO ERNST WISS, OF GRIESHEIM-ONLTHE-MAIN, GERMANY.

HYnEAuLIc-SEAL SAFETY-VALVE;

Patented, April 7, 190e.

Application tiled August 7, 1907. Serial No. 387,537.

' To CL'ZZA'wiOm-'it may concern:

Be it known that I, ALEXANDER BERN- .HARD DRGE'R, a subject "of the Emperor of ployed in connection with gas-blowpipes for` instance where acetylene and oxygen 1s used Hydraulic seal-safety-valves known eretofore prevent, it is- 'true, theentrance of oxygen into the reservoir for the fuel (acetyleneor the like) when counter currents arise, but they do not,

revent atmospheric air from being drawn 1n, when fuel is'to be sucked by means of an ejectoras for instance in -acetylene welding burners.

Inthe known devices a safety-pipe leads from the hydraulic seal tank from above themouth of the gas-feed-pipe upwards to an ppn tank situated at some ,higher place.

en the pressure of the oxygen increases beyond a certain limit it drives the water of the. seal upwards into the said safety-pi eJ ing the gaseed-pipe.

until the surface of the water sinks to t e mouth of this pipe. The surplus of oxygen then escapes by way of the same pipe and the upper `tank into the-atmosphere, while the amount of water in 'the seal between the mouth of the gas-feed-pipe and that of lthe safety-pipe revents the oxygen from enter- It is evident that if a lower pressure or a vacuum is created when aspirating the gas instead of the unallowed high pressure, air would pass into the seal by way of the safetyipe and further into the p'ipe leading to the urner. v

The object ofthe present invention is to construct an hydraulic seal safety val re, in which the drawback spoken of is not present. To this end thesafety-pi e isnot led up- Wards, but downwards andp bent to theshape of a U, and the tank into which. its end opens out, is vabout on the same height as the seal-tank. f x The Figures 1 to 3 show the valve in three different stages of operation, in'vertical secsaine height and connected therewith bythe U-shaped pipe c. -lnto the seal-tank a the gas-feedpipe e, which must have a greater length than'one of the legs of the U-shaped ipe, projects close to the bottom, while the u eg c2 of the pipe c opens out into this tank somewhat higher. To prevent water from splashing over into the gas-outlet pipe d, it

is advisable to make the tank (L not too shallow. The length of the leg of the pipe c decides the safety of the apparatus; for ordinary use it will be 0.5 to y1 meter As long Aas there is merely atmospheric pressure in thetank a, the water therein will be at the same level as in the open tank b, as is shown inFig. 1, but when a counter current of thel oxygen is formed thus increasing the' pressure inthe tank a the water in the same will be pressed partly into the pipe e and partly by way of the pipe cinto the tank until the level is lowered as far as the mouth of the leg c2, whereupon on further increase of pressure the water in the pipe -c is pushed y into the tank b, while at the same time the water in the pipe e rises still further to balance thepressure. On still further increase of pressure oxygen escapes by Way ofthe pipe 'c and through the water in the tank b into the atmosphere. The oxygen therefore cannot reachthe mouth of the pi e c, which remains filled withwater to a eight corresponding to the vlength of the legs of the pipe c.

If-there is -a 'sucking action in the pipe d, to such an extent that the gas entering by the pipe e is unable to destroy the vacuum in the tank a, the latter' will be iilled with water from thetank b and the leg c1 will become 4:more or less emptyaccording to the sucking power, Fig. 3, which rarely surpasses a column of water of 0.5 meter. The pipe c therefore always remains partly iilled with Water and no air can enter the seal, which would cause undesired mixtures in the seal. l claim: A

1. An hydraulic seal-safety valve having a closed tank and an open tank in fixed relation, and a' U-,shaped pipe connecting both tanks, gas-inlet pipe and an outlet-plpe for the closed tank.

2. An hydraulic seal-safety valve having a closed tank and an open tank, a- U'shaped pipe connecting both tanks and projecting into the closed tank at ysome distance from tank, an open tank, a U-sha ed ipe ,opening closed tank below the mouth of the U-shaped into said tanks on the same eve a gas-inlet pipe. pipe opening into the closed tank below the 3. An hydraulic seal comprising a closed f level of the opening of the U-shaped pipe, 1.5 S tank, an open tank on substantially the same I and a gas outlet in the closed tank above the levtlil, a gas-linllt pipe openinfg` into the closed l outlet of the U-shaped pipe. tan( near t e ottoni t ereo a conduit ooni neoting the tanks above the mouth of the l ALEXANDER BERNHARD DRAGER' gas-inlet pipe and an outlet pipe in the closed Witnesses: :o tank. f JOHANN HEINRICH DRGER,

4. An hydraulic. seal comprising a closed FRIEDRICH PLATE.

its bottom, a gas feed pipe opening into the 

